Apparatus for creating a layer of secondary air and steam above a hearth



July ll, 1939. J. ARKIN r-:r AL 2,165,880

APPARATUS FOR CREATING A LAYER OF SECONDARY AIR AND STEAM ABOVE A HEARTHFiled Nov. 50, -1936 Patented July 11, 1939 W.

UNITED STATES masso 2,165,880 APPARATUS FOR CREATING A LAYER OFSECONDARY AIR AND` HEARTH Jules Arkin, Warsaw,

TEAMl ABOVE A Poland, and Eustache Mille, Paris, France ApplicationNovember 30, 1936, Serial No. 113,520 In Poland December 7, 1935 4Claims.

This invention relates to an apparatus for creating a layer of secondaryair and steam above the re bed of a steam` boiler and likeinstallations. It differs from other apparatus of this type by aparticular system` of regulating the proportion of air and steam and, inaddition, by the particular combination of the steam supply with adouble supply of air, which permits a preheating of the air and bettermixing of the air and steam and, consequently, ensures a bettercombustion and satisfactory smoke-consumption.

One constructional form of the apparatus according to the invention isillustrated by way of example, in the accompanying drawing, wherein:Fig. 1 is a longitudinal axial section thereof; and Figs. 2 4 aresectionsI taken on the lines II-IL III-III and IVHIV, respectively ofFig. l. The apparatus comprises four principal parts I, 2, 3, and thaving a common axis. When the apparatus is assembled, only theinnermost tube I can be displaced and change its position relatively tothe other parts. The displacement of the tube I is effected by means ofthe thread 5 formed externally of the tube I and internally 25 of thetube 2, a locknut 6 being provided for locking same in position.

This displacement of the tube I regulates the annular opening betweenthe cone 'I of the tube I and the tapere'dend or cone 8 of the tube 2.

. This annular opening permits the passage of a i 4 extending portion oftube 3 and is retained in position by a locknut I9. This air, afterpassing through the apertures I3 in the tube 3, separates into twocurrents, one of which passes by way of the passage I4 between the tube3 and the tube 2, and the other by way of the apertures I5 and I6 intothe chamber 29 of the nozzle I.

Thus, the steam emerging from the annular opening between the cone 8 andthe cone 1 of tubes 2 and I respectively passes into the cylindrical endportion II of the tube il, entraining air fro-m the chamber of the tubeI, and then passes into the cylindrical end portion I'I of the tube 3,entraining the air supplied to the passage Ill between the tube 2 andthe tube 3. The end portion I'I extends into the rebox or is con- (o1.11o-s0) nected thereto by an extension tube, so as to deliver themixture into contact with the combustion products in the fire box overthe fire.

The rear opening of the tube I, to which may be connected apparatus forcontrolling the supply of steam, is closed by a cap 2|.

Due to the fact that the steam passes between the two layers of air I4and 20 which have already been heated by absorption of heat from thewalls of tubes I and 2, which are heated by the steam, an energeticmixing of air and steam in the apparatus is produced immediately uponcoming into contact with one another. The temperature atl which theycome into contact is kept as high as possible, which causes theformation above the grate of a water gas upon the water steam mixturebecoming admixed with the carbon of the smoke of the fire, whereby thesmoke disappears.

We claim:

1. Apparatus for supplying a mixture of preheated air and steam abovethe nre beds of boilers comprising a steam tube having an open forwardend, a small air tube within the steam tube forming with the steam tubea steam chamber and steam nozzle, the forward end of the small air tubebeing open and adjacent' the said nozzle so that air in said small airtube is influenced by steam issuing from said nozzle, a large air tubesurrounding the steam tube and extending forwardly beyond the steam tubeso that the steam tube and small air tube discharge `into the large airtube, an air jacket surrounding the large air tube and open to theatmosphere at its forward end, a steam conduit connected to the steamtube, and the rear portions of said small and large air tubes havingopenings whereby communication with said air jacket is effected, therear ends of said air tubes being otherwise closed to the atmosphere,whereby in operation steam issuing from the steam nozzle draws airforwardly in the small and large air tubes in heat exchange relationshipwith the steam in the steam chamber and nozzle and the air is thuspreheated before mixture with the steam in the forwardly extendingportion of the large air tube.

2. Apparatus according to claim l and in which the forward end portionof the steam tube is forwardly tapering internally and the small airtube and steam tube are adjustably connected together by screw 'threadsso as to be relatively adjustable longitudinally to regulate the steamoutlet opening of the nozzle.

3. Apparatus according to claim l and in which the large air tube has areduced portion extending forwardly beyond the air jacket tube, l

and a valve adjustably mounted on said forward- 1y extending portionadjacent the forward end of the jacket tube to regulate the admission ofair to the apparatus'.

4. Apparatus for supplying a mixture of steam and preheated air to afire box comprising a mixture tube the rear portion of which serves asan air tube, a steam tube Within said air portion of the mixture tube, asmall air tube Within the steam tube and forming with its outer Wall andwith the inner wall of the steam tube a steam chamber and a steamnozzle, a jacket surrounding said mixture tube and being open at itsfor- Ward end for admission of air, a steam conduit supplying steam tothe steam tube, the small air tube and air portion of the mixture tubehaving openings rearwardly of the steam chamber Whereby communicationwith the air jacket is effected, and having their rear ends closedwhereby air induced through the small air tube and air portion of themixture tube is required to pass in contact with the walls of thechamber formed by the steam tube and small air tube and be 10 preheatedbefore intermixture with the steam.

JULES ARKIN. EUSTACHE MILLE.

